<https://forum.spamcop.net/topic/8945-personal-blacklist-appears-to-be-ineffective/#comment-61154>
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"Here's a tracking URL for a spam that only appeared in my Held Mail after I had placed its sender in my personal blacklist at least twice: \n\nhttp://www.spamcop.net/sc?id=z1526205850zf...e34fac13e5f640z \n\nI started this thread after making a search on the SpamCop forums &amp; FAQ's for the term: \n\n\"personal blacklist.\"  There was only one hit, irrelevant to my concern. \n\nWhattaya mean, \"... haven't heard of anyone plugging IP addresses into [the personal blacklist]\" ? What's that list for, anyway ?  I feel that I can be as draconian as I wish, even to listing partial IP addresses, in the hope of shifting blackhat stuff that somehow escapes my selection of _all_ (one exception) of the blacklists that SpamCop offers.  That exception is the Spamhaus PBL which manages only to shift my own emails into Held Mail and no one else's. \n\nGreylisting does not work for forwarded emails.  We already discussed that. \n\nWhen I find spam in my Inbox, I dig out _all_ the IP addresses and domain names that I can find associated with that spam, whether forged or not.  I even dig out the spamvertised domains and _their_ ISP's. No one escapes my wrath.  There has been no reduction in false positives and no increase in false negatives as yet.  \n\namenex \n"
<https://forum.spamcop.net/topic/8945-personal-blacklist-appears-to-be-ineffective/>